Re: [PATCH 1/2] arm64: dts: qcom: monaco: Add EL2 overlay

[Rob Herring <robh@kernel.org>]

On Fri, 23 Jan 2026 16:05:02 +0530, Mukesh Ojha wrote:
> All the Monaco IOT variants boards are using Gunyah hypervisor which
> means that, so far, Linux-based OS could only boot in EL1 on those
> devices.  However, it is possible for us to boot Linux at EL2 on these
> devices [1].
> 
> When running under Gunyah, the remote processor firmware IOMMU streams
> are controlled by Gunyah. However, without Gunyah, the IOMMU is managed
> by the consumer of this DeviceTree. Therefore, describe the firmware
> streams for each remote processor.
> 
> Add a EL2-specific DT overlay and apply it to Monaco IOT variant
> devices to create -el2.dtb for each of them alongside "normal" dtb.
> 
> [1]
> https://docs.qualcomm.com/bundle/publicresource/topics/80-70020-4/boot-developer-touchpoints.html#uefi
> 
> Signed-off-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>
> ---
>  arch/arm64/boot/dts/qcom/Makefile        |  8 ++++++
>  arch/arm64/boot/dts/qcom/monaco-el2.dtso | 32 ++++++++++++++++++++++++
>  2 files changed, 40 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/qcom/monaco-el2.dtso
> 


My bot found new DTB warnings on the .dts files added or changed in this
series.

Some warnings may be from an existing SoC .dtsi. Or perhaps the warnings
are fixed by another series. Ultimately, it is up to the platform
maintainer whether these warnings are acceptable or not. No need to reply
unless the platform maintainer has comments.

If you already ran DT checks and didn't see these error(s), then
make sure dt-schema is up to date:

  pip3 install dtschema --upgrade


This patch series was applied (using b4) to base:
 Base: attempting to guess base-commit...
 Base: tags/next-20260122 (exact match)
 Base: tags/next-20260122 (use --merge-base to override)

If this is not the correct base, please add 'base-commit' tag
(or use b4 which does this automatically)


New warnings running 'make CHECK_DTBS=y for arch/arm64/boot/dts/qcom/' for 20260123103503.1259645-1-mukesh.ojha@oss.qualcomm.com:


Failed to apply 'arch/arm64/boot/dts/qcom/talos-el2.dtbo': FDT_ERR_NOTFOUND
make[5]: *** [scripts/Makefile.dtbs:95: arch/arm64/boot/dts/qcom/qcs615-ride-el2.dtb] Error 1
make[5]: Target 'arch/arm64/boot/dts/qcom/' not remade because of errors.
make[4]: *** [scripts/Makefile.build:544: arch/arm64/boot/dts/qcom] Error 2
make[4]: Target 'arch/arm64/boot/dts/qcom/' not remade because of errors.
make[3]: *** [scripts/Makefile.build:544: arch/arm64/boot/dts] Error 2
make[3]: Target 'arch/arm64/boot/dts/qcom/' not remade because of errors.
make[2]: *** [scripts/Makefile.build:544: arch/arm64] Error 2
make[2]: Target 'arch/arm64/boot/dts/qcom/' not remade because of errors.
make[1]: *** [/home/rob/proj/linux-dt-testing/Makefile:2090: .] Error 2
make[1]: Target 'arch/arm64/boot/dts/qcom/' not remade because of errors.
make: *** [Makefile:248: __sub-make] Error 2
make: Target 'arch/arm64/boot/dts/qcom/' not remade because of errors.